On Thu, Dec 09, 2010 at 02:25:05PM -0800, H. Peter Anvin wrote:> On 12/09/2010 01:46 PM, Matthew Garrett wrote:>> Windows reboots by hitting the ACPI reboot vector (if available), trying>> the keyboard controller, hitting the ACPI reboot vector again and then>> giving the keyboard controller one last go. Rework our reboot process a>> little to default to matching this behaviour, although we'll fall through>> to attempting a triple fault if nothing else works.>>>> Signed-off-by: Matthew Garrett<mjg@redhat.com>>> When this was discussed before we agreed to use ACPI reboot by default > with an ACPI cutoff date; this doesn't have any such cutoff.

Windows doesn't either. Older machines simply won't have the appropriate flag set in their FADT.